/**************************************************************
**
** Program : window_ex.java
**
** Author : Ryan J. Stradling
**
** Created : August 3, 1996
**
** Revisions :
**
** Purpose : This will allow the user to type in the input text
** field some text to be displayed in the output text field. 
** The user can also press the DISPLAY MOM key to display the message
** "Hi, Mom!". 
**
***************************************************************/

import java.awt.*;

/*********************************************************************
**
** Class : window_ex
**
** Inherits : From the applet class
**
** This class will handle the window interactions and the game interface
**
**********************************************************************/
public class window_ex extends java.applet.Applet {

    // Instance variables 

    TextField input_text, output_text;  // Textfields
    Button display_button;              // Display button
    Label input_label, output_label;    // Labels for textfields

    String out_string;                  // Entered string to output

    // Overridden init() method ---------------------------------------
    public void init () {
    // Initialize the window.

    setBackground(Color.blue); // Set background color to blue 
    setForeground(Color.white); // Set foreground color to white 

    setLayout(new FlowLayout()); // Set flow Style

    // Create the display button.
        display_button = new Button("DISPLAY MOM");
        add (display_button); 

    // Create input label and text field.
        input_label = new Label("Input: ");
        input_text = new TextField(15);
        add(input_label);
        add(input_text);


    // Create output label and text field.
       output_label = new Label("Output: ");
       add(output_label);	
       output_text = new TextField(15);
       add(output_text);
       output_text.setEditable(false);  // Set output field not editable

    } // end init() ------------------------------------------------------

    // Overridden method action() ----------------------------------------
    public boolean action (Event evt, Object arg) {
    // Handle the actions of the window.

       // Button hit
          if (evt.target instanceof Button) {
             DisplayText(evt);        
             return true;
          }

       // Text field data entry
          else if (evt.target instanceof TextField) {
                     if (evt.target == input_text) {
                        out_string = input_text.getText();
                        DisplayEnteredText();
                        input_text.setText("");
                        return true;
                     }
               }
          return false;
    } // end action() ----------------------------------------------------

    
    // method DisplayTextEvent(Event) ------------------------------------
    void DisplayText(Event evt) {
    // Display the text "Hi, Mom!" in the output field.

       if (evt.target == display_button) {
          output_text.setText("Hi, Mom!");
       }
    } // end DisplayTextEvent(Event) --------------------------------------


    // method DisplayEnteredText() ----------------------------------------
    void DisplayEnteredText() {
    // Display the text the user entered.

       if (out_string != null)
          output_text.setText(out_string);
    } // end DisplayEnteredText() ------------------------------------------

}